Infallibilism most commonly refers to a view, in epistemology (a branch of philosophy dealing primarily with the nature and conditions of knowledge), which states that in order for a person, s, to have knowledge of a proposition p it necessarily must be the case that s knows that p and cannot be wrong about p (i.e., it cannot be the case that p is false). This view is opposed to fallibilism, which is the belief that knowledge is attainable, but certainty is not. In religion, infallibilism is the belief that certain texts or persons cannot be wrong. The most famous example of religious infallibilism is the Catholic doctrine of Papal Infallibility, which states that the Pope's teaching is considered infallible under specific conditions.

See also: Infallibility, Fallibilism